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FLOW: A variable or measurement that is defined for a period of time (as opposed to an instant in time). A flow can only be measured over a period. For example, GDP is the flow of production during a given year. Income is another flow measures important to the study of economics.

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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time strolling through a department store wanting to buy either a wall poster commemorating the first day of winter or blue cotton balls. Be on the lookout for strangers with large satchels of used undergarments.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
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LRAS
Long Run Aggregate Supply
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